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06 January 2017 : Laboratory Research  

miR-340 Inhibits Proliferation and Induces Apoptosis in Gastric Cancer Cell Line SGC-7901, Possibly via the AKT Pathway

Jinzhong Yu1ABCDEF*, Ruijie Wang2BCDEF, Jianshe Chen3BCDF, Jinfeng Wu4CDF, Zhongqin Dang1BCF, Qinsheng Zhang1CF, Bo Li1BF

DOI: 10.12659/MSM.898449

Med Sci Monit 2017; 23:71-77

Abstract

BACKGROUND: Gastric cancer is among the most common types of cancer, with high morbidity and mortality. MicroRNAs (miRNAs) play vital roles in the tumorigenesis and biology of gastric cancer. This study aimed to reveal the role of miR-340 in gastric cancer cell proliferation and apoptosis and to elucidate the potential mechanisms.

MATERIAL AND METHODS: Human gastric cancer cells SGC-7901 were used in this study for cell transfection with miR-340 mimic or inhibitor. After transfection, cell viability, proliferation, and apoptosis were examined by MTT, BrdU, and flow cytometry assays, respectively. The protein level changes of p27, p21, Caspase 3 (CASP3), B cell lymphoma 2 (BCL2), BCL2-associated X protein (BAX), and v-AKT murine thymoma viral oncogene (AKT) were detected by Western blot.

RESULTS: Overexpression of miR-340 significantly reduced cell viability and proliferation (P<0.01), and induced cell apoptosis (P<0.01) of SGC-7901. miR-340 elevated the protein level of cell cycle inhibitor p27, but did not affect the level of p21. Apoptosis-related factors pro-CASP3, cleaved-CASP3, and BAX were promoted, and BCL2 was inhibited by miR-340. miR-340 also suppressed the phosphorylation of AKT. Opposite effects were detected when SGC-7901 cells were transfected with miR-340 inhibitor.

CONCLUSIONS: These results indicate that miR-340 can inhibit proliferation and induce apoptosis of SGC-7901 cells, suggesting its roles in protecting against gastric cancer. The roles of miR-340 in gastric cancer cells may be associated with its regulation of the AKT pathway. Thus, miR-340 may be a potential therapeutic strategy for gastric cancer treatment.

Keywords: Cell Cycle Checkpoints - genetics, Apoptosis - genetics, Cell Survival - genetics, MicroRNAs - genetics, Signal Transduction

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750